Write the names of isotopes of hydrogen. What is the mass ratio of these isotopes ?

Explanation

### Step-by-Step Solution

1. **Understanding Isotopes**:
- Isotopes are variants of a chemical element that have the same number of protons (same atomic number) but different numbers of neutrons, resulting in different mass numbers.

2. **Identifying Isotopes of Hydrogen**:
- Hydrogen has three main isotopes:
- **Protium**: This is the most common isotope of hydrogen, represented as \( ^1H \) or simply H. It has 1 proton and 0 neutrons.
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